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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effect of depletion forces on the morphological structure of carboxymethyl cellulose and micro/nano cellulose fiber suspensions

Full text
Author(s):
Souza, Sivoney Ferreira [1] ; Mariano, Marcos [2, 1] ; De Farias, Marcelo A. [1] ; Bernardes, Juliana Silva [1]
Total Authors: 4
Affiliation:
[1] CNPEM, Brazilian Nanotechnol Notional Lab LNNano, BR-13083970 Campinas, SP - Brazil
[2] Univ Campinas UNICAMP, Inst Chem, BR-13083970 Campinas, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Journal of Colloid and Interface Science; v. 538, p. 228-236, MAR 7 2019.
Web of Science Citations: 1
Abstract

Cellulose nanofibers (CNF) can present a high viscosity and thixotropic behavior when dispersed in water. In this work, CNF isolated from sugarcane bagasse and modified by N-oxyl-2,2,6,6-tetramethylpiperidine (TEMPO) oxidation was added to a solution of carboxymethyl cellulose (CMC). This process produced an unexpected viscosity due to a synergistic effect that was observed macroscopically through rheology analysis. The phenomenon known as depletion flocculation was observed, which was caused by the reduction of the excluded volume. The interactions of the system were studied by ultraviolet-visible spectroscopy (UV-Vis), optical microscopy, and cryogenic transmission electron microscopy (cryo-TEM), which demonstrated the presence of the particle/polymer repulsion and subsequent formation of domains composed of aligned micro and nanocellulose particles clusters and nanofibers distributed throughout the sample, forming a percolated 3D structure responsible for a strong gelling and colloidal stability. (C) 2018 Elsevier Inc. All rights reserved. (AU)

FAPESP's process: 17/50133-8 - Gel behavior of cellulose nanofiber smart materials
Grantee:Juliana da Silva Bernardes
Support Opportunities: Regular Research Grants
FAPESP's process: 16/04514-7 - Cellulose nanoparticles as rheology modifiers for complex fluids
Grantee:Juliana da Silva Bernardes
Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants